The Doppler effect
1 mark · EasyWhich change will a person hear as a sound source moves towards them?
Show answer
Correct option: A higher-pitched sound
Common mistakes: A lower-pitched sound; No change in sound
Show mark scheme and worked solution
Marking points
B1 · 1 mark · Correct option selected: A higher-pitched sound.
Worked solution
As a source approaches, the waves are compressed so frequency increases and pitch is higher.